feat: add graph_execution_module config table

[pyramation]

Summary

Adds metaschema_modules_public.graph_execution_module table to @pgpm/metaschema-modules, syncing with constructive-db's pgpm-modules/metaschema-modules.

This config table registers partitioned graph execution state (executions, outputs, node_states) generated by the graph_execution_module generator at provision time. Required by the module loader in constructive-functions, which queries this table to resolve execution table locations.

-- Key columns beyond standard module fields:
graph_module_id uuid NOT NULL  -- links to parent graph_module
executions_table_id uuid       -- populated by BEFORE INSERT trigger
outputs_table_id uuid
node_states_table_id uuid

Depends on graph_module (FK constraint + plan dependency).

Link to Devin session: https://app.devin.ai/sessions/671da39a6b554e5ea3710c725acc0696
Requested by: @pyramation

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